Tyndall National Institute - Conference Items
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Item Advancements in GaN-based horizontal-cavity and surface-emitting superluminescent diodes for next-generation holographic displays(Society of Photo-Optical Instrumentation Engineers (SPIE), 2025-03-19) Muhammet, Genc; Li, Zhi; Morales, Juan S. D.; Hazarika, Abhinandan; Hwang, How Yuan; Akşit, Kaan; O'Carroll, Gerry; Roycroft, Brendan; Corbett, Brian M.; Enterprise IrelandSurface-emitting superluminescent diodes (SLDs) with horizontal cavities in the visible spectrum offer a significant advancement in optoelectronics, combining the benefits of LEDs and laser diodes. Characterized by broad emission spectrum, directionality, and high output power, SLDs are ideal for applications requiring high-brightness, high spatial coherence, and low temporal coherence, such as imaging and projection systems due to their speckle-free emission. This study focuses on SLDs emitting in the blue spectral region using gallium nitride (GaN) materials. Advanced fabrication techniques yielded a surface-emitting architecture using horizontal ridge waveguiding with a 45° total internal reflector on the facets, achieving high power and broad spectral output. The SLDs demonstrated a peak emission wavelength in the 4xx nm range with FWHM of 2-8 nm, depending on cavity length, and peak optical output power up to 1 W under pulse conditions. These features make SLDs cost-effective and suitable for next-gen optical systems, including holographic display applications, highlighting their potential for widespread adoption in high-performance technologies.Item Heterogeneous integration of 20x10 µm blue micro-LEDs/pixels on GaN HEMTs for visible light communication(Society of Photo-Optical Instrumentation Engineers (SPIE), 2025-03-19) Muhammet, Genc; Rahman, Sheikh Ifatur; Li, Zhi; Roycroft, Brendan; Arafata, Yeasir; Parbrook, Peter J.; Ringel, Steven A.; Maxwell, Graeme; Corbett, Brian M.; Rajan, Siddharth; Tyndall National Institute; Ohio State UniversityThe development of next-generation communication networks aims to provide faster and more reliable solutions in a small form factor. Visible light communication (VLC) has emerged as a promising complementary technology to traditional radio frequency wireless communication due to its exceptional efficiency, high modulation speeds, and freedom from the congested radio spectrum. Recent advancements have focused on gallium nitride (GaN)-based micro-light-emitting diodes (microLEDs) for VLC. However, these microLEDs typically require high injection current densities and high-frequency operation, necessitating the use of independent drivers and resulting in bulky systems. This study presents an innovative approach to overcome these limitations by heterogeneously integrating of 20x10 µm2 blue microLEDs using transfer printing onto a GaN-based high electron mobility transistor (HEMT) target wafer grown on silicon carbide (SiC) substrate. This integration allows for a compact, single-chip platform where the emission from a single microLED is modulated by tuning the gate voltage of its GaN HEMT. The resulting on-chip system achieves with a modulation bandwidth of 100 MHz, maintaining a small form factor. Our findings suggest that this approach holds significant promise for the development of future large-scale VLC systems on a single chip, offering broad application prospects.Item Cryogenic packaging for scalable hybrid quantum PICs(Optica Publishing Group, 2024) Bernson, Robert; Witte, Alexander; Clark, Genevieve; Gradkowski, Kamil; Saha, Matthew; Leenheer, Andrew; Chen, Kevin; Gilbert, Gerald; Eichenfield, Matt; Englund, Dirk; O’Brien, PeterWe demonstrate a robust packaging method for PICs using surface grating couplers. We use this method to create diamond color center quantum memory modules with active photon routing, strain tuning, and operation to millikelvin temperatures.Item Fabry-Pérot cavity in SiN for non-linear applications(Optica Publishing Group, 2024-12) Monopoli, Davide; Calò, Giovanna; D’Orazio, Antonella; Wall, Jack; Badri, S. Hadi; O’Faolain, Liam; Devarapua, G. C. R.; Science Foundation Ireland; Pilot PhotonicsWe present side-coupling Fabry-Pérot-based resonant mirror cavities in the 800 nm thick silicon nitride platform, implementing tapered and conventional Bragg grating. Experimental results highlight enhanced Q-factors and tunability, crucial for femtosecond hybrid laser generation.Item Evanescent wave quartz-enhanced photoacoustic spectroscopy employing dielectric coated side-polished fibers for sensing applications(Optica Publishing Group, 2024-12) Twomey, Cian F.; Biagi, Gabriele; Ruth, Albert A.; Ali, Farhan; Di Falco, Andrea; O’Faolain, Liam; Walsh, AntonWe present an all-fiber laser gas analyzer using quartz-enhanced photoacoustic spectroscopy, featuring a dielectric-coated side-polished fiber, custom quartz tuning fork, and acoustic micro-resonators, achieving over 42 times enhancement in QEPAS signal for improved detection performance.